An open pipe of length l is resonating at its fundamental frequency. which statement is correct? a. the wavelength is 3l/2 and there are two displacement antinodes located inside the pipe. b. the wavelength is l and there is a displacement antinode at the pipe's midpoint. c. the wavelength is l and there is a displacement node at the pipe's midpoint. d. the wavelength is 2l and there is a displacement node at the pipe's midpoint. e. the wavelength is 2l and there is a displacement antinode at the pipe's midpoint.